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It is understood that the fighter known as Abu Abdullah has previously appeared in another propaganda video.

In November, the same fighter praised the Paris attacks and boasted that France would be attacked again.

The jihadis are also shown among a young audience of children, watching a propaganda ISIS film on a projector screen.

The shocking footage, which appears to have been filmed in the Iraqi city of Mosul, was uploaded following the triple suicide bomb attack at Brussels's main airport and metro station

The jihadis are also shown among a young audience of children, watching a propaganda ISIS film on a projector screen

In November, the same fighter praised the Paris attacks and boasted that France would be attacked again

The news comes as ISIS's top finance officer and other senior leaders were likely killed this week in a major offensive targeting the militant group's financial operation.

The targets were confirmed by U.S. Defense Secretary Ash Carter in a statement today.

Carter said the United States believes it killed Haji Iman, a senior Islamic State leader in charge of the group's finances as well as some plots and external affairs.

'We are systematically eliminating ISIL's cabinet,' Carter told reporters at a briefing at the Pentagon, using an acronym to refer to the group.

Earlier media reports said Haji Iman, who also went by Abd ar-Rahman Mustafa al-Qaduli and other aliases, had been killed in a U.S. air strike in Syria, but Pentagon officials gave few details of the operation.

34 people were killed and dozens wounded in the attack, which was carried out by brothers Ibrahim and Khalid El Bakraoui and master bombmakerNajim Laachraoui

A young audience of children gather to watch a jihadi propaganda video, thought to be in Mosul

The news comes as ISIS's top finance officer and other senior leaders were likely killed this week in a major offensive targeting the militant group's financial operation